Surface subsidence engineering/

ανά Peng, Syd S., 1939-
Έκδοση 1992

Coal mine ground control/

ανά Peng, Syd S., 1939-
Έκδοση 1978

Second conference on ground control in mining : proceedings, West Virginia University, Morgantown, West Virginia, July 19-21, 1982 /

Έκδοση 1982